Temperature responding device



Jan. 19, 1943. M. HURST EFAL 2,308,922

TEMPERATURE RESPONDING DEVICE Filed Sept. 21, 1939 byaspring'rinainsuchamanneras Patented Jan. 19, 1943 UNITED STATES PATENT OFFICE 2,308,922 TEMPERATURE BESPONDING DEVICE Max mm, swarm, and Alfred sawm- Vaihingen-on-thethe Alien Fillers, Property Custodian Germannvestedin Application September :1, 1m, Serial N5. 295,990 I I In Germany September 9, i038 3 Claims.

' The present invention relates to a device which responds to varying conditions, such as for examdependently upon the temperature of the supplyof combustion air, in such a manner that the fuel supply to the engine decreases as the temperature rises, and viceversa.

As the weakening of the fuel and air mixture canonlybetakentoacertainpolntithasbeen suggested to limit the movement performed by the thermostat as the temperature increases. It has been found, on the other hand, that in many cases no increase of output is produced by a further richening of the fuel and air mixture after a certain minimum temperature has been passed. On the contrary, when these temperature limits have been passed the thermostat mere. 17 produces an excessive richness of the mixture with consequent waste of fuel.

In order to save fuel at temperatures below this limit, the lever equipment according tothe invention,issodesignedandarrangedthatitis supported against a stationary part of the apparatus as soon as the temperature falls below a predetermined minimum. so that when the temperature fallsstillfurthertheleverisunableto follow the movement of the thermostat.

Thedevicedisclcsedandclaimedhereinisparticularly adapted for use with the fuel-air mixture control means for internal combustion engines disclosed in our application Serial No. 197,458, new Patent No. 2,213,997, to which referenee'is made as illustrating one practical application or use of this invention. 4

The invention is more particularly described with reference to the accompanying drawing which shows, by way of example, two forms of 4 construction of the invention and in which:

Figure 1 illustrates the first and Figure 2 the second form of construction.

In Figure l the thermostat cartridge 2 is mounted within a threaded nipple l secured in the induction pipe- I of an internal combustion engine and is'supported by means of a spring 3 and a ring 4 which is secured within the nip to be resil shown in the drawing. A slotted.- barrel 5 is screwed on to the threaded nipple l and a hous ing 8 is pushed over the barrel and is held fixed by means of a screw cap I which is in threaded engagement with the free end of thebarrel i. Bee foretighteningthescrewcapl,thehousing6,a projection of which engages within the slot 8 of the barrel 5, can be adjusted with the screw cap into any desired position according to the space adjustment required. Within the housin a pin II is rotatably mounted and on to it is keyed a lever I I, the movement of which is transmitted through the pin or actuating element ll for the purpose of adjusting the fuel supply and the mixture of the engine. As the temperature fal1s.the medium contained in the thermostat cartridge 2 contracts, with the result that the pin or adjustment member I! is displaced in an inwardsdirectionortotheleft mm. 1.. Assoon as a predetermined minimum temperature is reached, the lever ll which normally abuts against the end face of the pin. rests its nose-like projection it against the barrel ll of the thermostat cartridge and is consequently unable to follow the further movement of the pin in the inward direction. Consequently when this minimum temperature is passed the operation of the thermostat is discontinued, with the result that the fuel and air mixture cannot become any richer.

It is possible to adjust the device to suit various temperatures if the stop projection 13 is designed asanadjustablescrew ",asshownin Figure 2. The adjustable'screw is locked in positionbymeansofthenuts It and il. 'Theexamplesshowninthedrawing areparticularly favourable constructions of the device for avoiding the exceaively rich fuel and air mixtureintheeventofthetemperatuxefallingbelow a minimum. Naturally the predetermined rotation of the control lever. or the displacement the control member, can be limited by a number of other forms of construction.

Wedeclarethstwhatweclaimis: I l. A fuel controlling device for internal combustion engines. comprising an actuating element. an adiustment member movablein consequence of temperature variations, a lever connected with the actuating element and operatively connected with said adjustment member so as to partake in themovement of said adjustment member, and means for interrupting said connection between the lever and the adjustment member when the temperature reaches a given iently displaceable from contact position ll Milt. I

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ALHIED 

